CN218448361U - Winding type battery cell, battery assembly and power utilization device - Google Patents
Winding type battery cell, battery assembly and power utilization device Download PDFInfo
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- CN218448361U CN218448361U CN202222831093.5U CN202222831093U CN218448361U CN 218448361 U CN218448361 U CN 218448361U CN 202222831093 U CN202222831093 U CN 202222831093U CN 218448361 U CN218448361 U CN 218448361U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The application provides a winding type battery cell, a battery assembly and an electric device, wherein the winding type battery cell comprises a main body part and a tab part; one side of each cathode winding part in one part of the cathode winding parts is connected with one cathode tab, and one side of each cathode winding part in the other part of the cathode winding parts is connected with two cathode tabs; and/or one side of each anode winding part in one part of the anode winding parts is connected with one anode tab, and one side of each anode winding part in the other part of the anode winding parts is connected with two anode tabs. The utility model discloses an aspect has increased the quantity of negative pole utmost point ear/positive pole utmost point ear, has improved the area of overflowing of coiling formula electricity core, and on the other hand has avoided too much negative pole utmost point ear/positive pole utmost point ear and conductive connection welded joint to appear the layer rosin joint because to the restraint of negative pole utmost point ear/positive pole utmost point ear quantity.
Description
Technical Field
The utility model relates to a battery technology field especially relates to coiling formula electricity core, battery pack and power consumption device.
Background
This section provides background information related to the present application and is not necessarily prior art.
Secondary batteries currently on the market are receiving wide attention due to their advantages such as ultra-long life, safety in use, and large capacity. The cell of a secondary battery is a major component affecting the electrochemical performance of the secondary battery. Taking a wound battery cell as an example, the wound battery cell is formed by winding a cathode plate, an anode plate and a diaphragm, and at least one tab is respectively arranged on the cathode plate and the anode plate. In order to increase the flow area and reduce the internal resistance of the battery, a plurality of tabs are respectively arranged on the cathode pole piece and the anode pole piece of a partial winding type battery cell. Along with the trend of secondary battery capacity increase, the pole piece number of piles of coiling formula electricity core increases gradually, and the number of piles of a plurality of utmost point ears of negative pole piece and a plurality of utmost point ears of positive pole piece also increases thereupon to the number of piles of a plurality of utmost point ears of negative pole piece and a plurality of utmost point ears of positive pole piece appear easily too much problem, this problem then makes current ultrasonic wave vibrations energy can't pierce through the multilayer utmost point ear easily, thereby leads to the utmost point ear of electricity core and the problem of conductively connected welded joint appearance layer rosin joint.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application mainly solved is that the number of piles of coiling formula electric core utmost point ear is too much, leads to the utmost point ear of electric core and the problem of the rosin joint between layer to appear in electrically conductive connection welded joint.
In order to solve the technical problem, the application adopts a technical scheme that: a wound cell, comprising:
the main body part comprises a cathode pole piece, an anode pole piece and a diaphragm; the diaphragm is arranged between the cathode pole piece and the anode pole piece in a laminated manner; the main body part is wound around a virtual axis to form a flat wound body; the main body part comprises a plurality of turns of winding parts along the winding direction; the winding part comprises a cathode winding part, an anode winding part and a diaphragm winding part;
the pole ear part is connected to one side of the main body part and comprises a plurality of cathode pole lugs and a plurality of anode pole lugs;
one side of each cathode winding part in one part of the cathode winding parts is connected with one cathode tab, and one side of each cathode winding part in the other part of the cathode winding parts is connected with two cathode tabs; the two cathode tabs of each cathode winding part in the other part of the cathode winding parts are positioned on two opposite sides of the virtual axis along the thickness direction of the main body part; and/or the presence of a gas in the gas,
one side of each anode winding part in one part of the anode winding parts is connected with one anode tab, and one side of each anode winding part in the other part of the anode winding parts is connected with two anode tabs; the two anode tabs of each of the other part of the anode winding portions are located on opposite sides of the virtual axis in the thickness direction of the main body portion.
In some embodiments, one cathode tab is connected to one side of each of a portion of the cathode windings and two cathode tabs are connected to one side of each of another portion of the cathode windings; and one side of each anode winding part in one part of the anode winding parts is connected with one anode tab, and one side of each anode winding part in the other part of the anode winding parts is connected with two anode tabs.
In some embodiments, one cathode tab is connected to one side of each of the cathode windings in one portion of the cathode windings, two cathode tabs are connected to one side of each of the cathode windings in another portion of the cathode windings, and the two cathode tabs of each of the cathode windings in the other portion of the cathode windings are arranged axisymmetrically in the thickness direction of the main body portion; and each anode winding part is connected with an anode tab.
In some embodiments, one side of each of the one part of the anode windings is connected with one anode tab, one side of each of the other part of the anode windings is connected with two anode tabs, and the two anode tabs of each of the other part of the anode windings are axisymmetrically arranged in the thickness direction of the trunk portion; and each cathode winding part is connected with a cathode tab.
In some embodiments, one side of each of the first half of the cathode windings is connected with two cathode tabs, and one side of each of the second half of the cathode windings is connected with one cathode tab, in a direction from the inner ring to the outer ring; and/or the presence of a gas in the atmosphere,
and in the direction from the inner ring to the outer ring, one side of each anode winding part in the first half of the anode winding parts is connected with two anode tabs, and one side of each anode winding part in the second half of the anode winding parts is connected with one anode tab.
Preferably, one side of each of the odd-numbered turns of cathode winding parts is connected with two cathode tabs, and one side of each of the even-numbered turns of cathode winding parts is connected with one cathode tab, in a direction from the inner turn to the outer turn; or one side of each cathode winding part in the cathode winding parts of the odd-numbered circles is connected with one cathode tab, and one side of each cathode winding part in the cathode winding parts of the even-numbered circles is connected with two cathode tabs; and/or the presence of a gas in the gas,
one side of each anode winding part in the anode winding parts of the odd turns is connected with two anode tabs, and one side of each anode winding part in the anode winding parts of the even turns is connected with one anode tab; or one side of each anode winding part in the anode winding parts of the odd turns is connected with one anode tab, and one side of each anode winding part in the anode winding parts of the even turns is connected with two anode tabs.
In some embodiments, the cathode sheet includes a cathode current collector and a cathode active material layer disposed on one side of the cathode current collector; the anode pole piece comprises an anode current collector and an anode active substance layer arranged on one side of the anode current collector;
one end of the cathode tab is connected with the cathode current collector of the corresponding cathode winding part, and the other end of the cathode tab is far away from the cathode current collector along the virtual axis; one end of the anode tab is connected with the anode current collector of the corresponding anode winding part, and the other end of the anode tab is far away from the anode current collector along the virtual axis; along the thickness direction of main part, lie in the range upon range of setting of a plurality of negative pole utmost point ears that virtual axis is same one side, lie in the range upon range of setting of a plurality of positive pole utmost point ears that virtual axis is same one side.
In some embodiments, the thickness of the cathode tab is the same as the thickness of the cathode current collector; the thickness of the anode tab is the same as that of the anode current collector.
In some embodiments, in the virtual axis direction, the plurality of cathode tabs arranged in a stack are equal-length tabs or gradually-changed-length tabs; in the virtual axis direction, a plurality of anode tabs which are arranged in a stacked mode are tabs with equal length or tabs with gradually changed length.
In some embodiments, the plurality of cathode tabs arranged in a stacked manner are equal-length tabs, and the length of each cathode tab is 28% -29% of the width of a cathode winding part connected with the cathode tab; the anode tabs arranged in a stacked mode are tabs with equal length, and the length of each anode tab is 28% -29% of the width of the anode winding portion connected with the anode tabs.
In some embodiments, the stacked cathode tabs are gradual-length tabs, and among the cathode tabs, the maximum length of the cathode tab is 28% -29% of the width of the cathode winding part connected with the cathode tab, and the minimum length of the cathode tab is 19% -20% of the width of the cathode winding part connected with the cathode tab; the lengths of a plurality of cathode tabs which are arranged in a laminated manner are gradually decreased layer by layer along the direction from the inner ring to the outer ring according to the equal difference size;
the anode tab winding device comprises a plurality of anode tabs, a winding mechanism and a winding mechanism, wherein the plurality of anode tabs are stacked and are of gradually-changed lengths, the maximum length of each anode tab is 28% -29% of the width of an anode winding part connected with the anode tab, and the minimum length of each anode tab is 19% -20% of the width of the anode winding part connected with the anode tab; the lengths of the anode tabs which are arranged in a stacked mode are gradually decreased layer by layer according to the equal difference size from the inner ring to the outer ring.
In some embodiments, the width of the end of the cathode tab, which is far away from the cathode current collector, is 10% to 12.5% of the circumference of the innermost coil winding part of the flat winding body, and the width of the end of the cathode tab, which is connected with the cathode winding part, is 11% to 14% of the circumference of the innermost coil winding part of the flat winding body.
In some embodiments, the flat wound body has a length direction and a width direction; the virtual axis is parallel to the width direction; the width of the anode pole piece is larger than that of the cathode pole piece, and the length of the anode pole piece is larger than that of the cathode pole piece.
In some embodiments, the innermost turn of the flat winding is a partial anode winding; the outermost ring of the flat wound body is a partial anode wound portion.
In some embodiments, one or two cathode tabs are attached to one side of each of the cathode windings; one side of each anode winding part in the anode winding parts is connected with one or two anode tabs; or the like, or a combination thereof,
one side of each cathode winding part in the cathode winding parts is connected with one or two cathode tabs; in the anode winding part, the anode winding part at the innermost circle or the anode winding part at the outermost circle is not provided with an anode tab, and one or two anode tabs are connected to one side of each of the other anode winding parts.
In order to solve the above technical problem, another technical solution adopted by the present application is: a battery comprises any one of the winding type battery cores.
In order to solve the technical problem, the other technical scheme adopted by the application is as follows: a battery pack comprises the battery.
In order to solve the technical problem, the other technical scheme adopted by the application is as follows: an electric device comprises the battery pack.
Has the advantages that: the utility model discloses a cathode tab/anode tab is connected to one side of every cathode winding portion/positive pole winding portion in some cathode winding portion/positive pole winding portion, two cathode tab/positive pole tabs are connected to one side of every cathode winding portion/positive pole winding portion in another part cathode winding portion/positive pole winding portion, the quantity of cathode tab/positive pole tab has been increased on the one hand, the area of overflowing of coiling formula electricity core has been improved, on the other hand because the restraint to cathode tab/positive pole tab quantity, avoided too much cathode tab/positive pole tab and electrically conductive connection welded joint appear the layer rosin joint.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a winding type battery cell provided in the present application;
fig. 2 is a schematic top view of the wound cell provided in fig. 1;
fig. 3 is a schematic structural diagram of a pole piece and a diaphragm of the wound cell provided in fig. 1;
fig. 4base:Sub>A isbase:Sub>A partial cross-sectional view of the wound cell provided in fig. 2 taken along linebase:Sub>A-base:Sub>A;
fig. 4B is a partial cross-sectional view of the wound cell provided in fig. 2 along line B-B;
fig. 5base:Sub>A isbase:Sub>A second partial cross-sectional view of the wound cell provided in fig. 2 along linebase:Sub>A-base:Sub>A;
fig. 5B is a second partial cross-sectional view of the wound cell provided in fig. 2 along line B-B;
fig. 6 is a schematic top view of a second embodiment of a wound cell provided herein;
fig. 7 is a schematic top view of a third embodiment of a wound cell provided herein;
fig. 8 is a schematic top view of a fourth embodiment of a wound cell provided in the present application;
fig. 9 is a schematic top view of a fifth embodiment of a wound battery cell provided in the present application;
fig. 10 is a schematic top view of a sixth embodiment of a wound cell provided herein;
FIG. 11 is a schematic diagram of a cell provided herein;
FIG. 12 is a schematic view of a battery pack provided herein;
fig. 13 is a schematic structural diagram of an electric device provided in the present application.
Reference numerals:
100-winding type battery core, 10-main body part, 11-cathode pole piece, 12-anode pole piece, 13-diaphragm, Y-virtual axis, H-thickness of main body part, X-axis perpendicular to thickness direction of main body part and perpendicular to virtual axis direction, 101-winding part, 101 a-cathode winding part, 101 b-anode winding part, 101 c-diaphragm winding part, 20-pole ear part, 21-cathode pole ear, 22-anode pole ear, 11 a-cathode current collector, 11 b-cathode active material layer, 12 a-anode current collector, 12 b-anode active material layer, length of L-cathode/anode pole ear, width of W-cathode/anode winding part, width of K1-cathode/anode pole ear end far away from cathode/anode current collector, width of K2-cathode/anode pole ear connecting with cathode/anode current collector, S1-first frame, S2-second frame, 200-battery, 210-shell, 300-battery component, 400-electric vehicle, 401-controller, 402-motor.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise. In the embodiment of the present application, all directional indicators (such as up, down, left, right, front, rear \8230;) are used only to explain the relative positional relationship between the components, the motion situation, etc. at a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
The research personnel of the application find out in the research that: the overcurrent area of the battery cell is the product of the sum of the thicknesses of the multiple layers of tabs and the width of the tabs. Some limit energy density's electric core designs, substrate thickness is attenuate as far as possible, for satisfying the requirement of the area of overflowing, can only increase the utmost point ear number of piles or widen under the utmost point ear wide, it is unchangeable to be the utmost point ear number of piles, the utmost point ear width is widened, under the condition that utmost point ear dislocation accords with the standard, the dislocation can interfere the lower plastic under the explosion-proof valve left, the bad risk of plastic under the utmost point ear overlap joint appears (under the electric core high temperature cycle condition, lower plastic can soften the deformation, it is possible directly to contact with battery explosion-proof valve with lower plastic lapped utmost point ear, cause the short circuit, the risk of battery firing promotes by a wide margin), or to right dislocation, can interfere annotate the liquid hole, cause annotate liquid hole jam risk. Therefore, increasing the number of layers of the tab is a preferable way to meet the requirement of the flow area. However, the number of layers of the tab cannot be increased without limit, and the problem of inter-layer cold joint of the tab of the battery cell and the conductive connection welding joint is avoided under the condition of increasing the number of layers of the tab.
The present application will be described in detail with reference to the drawings and examples.
Referring to fig. 1 to 4B, fig. 1 isbase:Sub>A schematic structural diagram ofbase:Sub>A wound cell provided in the present application, fig. 2 isbase:Sub>A schematic top view of the wound cell provided in fig. 1, fig. 3 isbase:Sub>A schematic structural diagram ofbase:Sub>A pole piece andbase:Sub>A diaphragm of the wound cell provided in fig. 1, fig. 4base:Sub>A isbase:Sub>A partial cross-sectional view of the wound cell provided in fig. 2 alongbase:Sub>A linebase:Sub>A-base:Sub>A, and fig. 4B isbase:Sub>A partial cross-sectional view of the wound cell provided in fig. 2 alongbase:Sub>A line B-B.
Referring to fig. 1 to 4b, an embodiment of the present application provides a winding type battery cell 100, which includes a main body portion 10 and a tab portion 20.
The main body 10 includes a cathode plate 11, an anode plate 12, and a separator 13. The separator 13 is laminated between the cathode tab 11 and the anode tab 12. The main body 10 is wound around the virtual axis Y to form a flat wound body. The main body 10 includes a plurality of windings 101 in the winding direction. The winding portion 101 includes a cathode winding portion 101a, an anode winding portion 101b, and a separator winding portion 101c. Each of the wound portions 101 makes one turn around the virtual axis Y, and each of the wound portions 101 forms two layers of sub-wound portions in the thickness H direction of the main body portion 10, each layer of sub-wound portions making one half turn around the virtual axis Y. The two-layer sub-winding portions of each winding portion 101 are disposed axisymmetrically in the thickness direction of the main body portion 10, that is, axisymmetrically about an axis X perpendicular to the thickness H direction of the main body portion 10 and perpendicular to the virtual axis Y direction. Each layer of the sub-winding part comprises a cathode sub-winding part, a diaphragm sub-winding part and an anode sub-winding part which are arranged in a stacked mode.
The tab part 20 is connected to one side of the body part 10, and includes a plurality of cathode tabs 21 and a plurality of anode tabs 22.
One cathode tab 21 is connected to one side of each cathode winding portion 101a of one part of the cathode winding portions 101a, and two cathode tabs 21 are connected to one side of each cathode winding portion 101a of the other part of the cathode winding portions 101 a. The two cathode tabs 21 of each cathode winding portion 101a of the other portion of cathode winding portions 101a are located on opposite sides of the virtual axis Y in the thickness H direction of the main body portion 10. That is, one cathode tab 21 is connected to one side of each cathode winding 101a of one portion of the cathode winding 101a, and one cathode tab 21 is connected to one side of each cathode sub-winding of each layer of each cathode winding 101a of the other portion of the cathode winding 101 a.
And/or one side of each anode winding part 101b of one part of the anode winding parts 101b is connected with one anode tab 22, and one side of each anode winding part 101b of the other part of the anode winding parts 101b is connected with two anode tabs 22. The two anode tabs 22 of each anode winding portion 101b of the other part of the anode winding portions 101b are located on opposite sides of the virtual axis Y in the thickness direction of the main body portion 10. That is, one anode tab 22 is connected to one side of each anode winding portion 101b of one part of the anode winding portions 101b, and one anode tab 22 is connected to one side of each layer of anode sub-winding portion of each anode winding portion 101b of the other part of the anode winding portions 101 b.
In the present application:
the winding type battery cell 100 is a flat winding body formed by winding the cathode plate 11, the anode plate 12 and the diaphragm 13 around the virtual axis Y manually or mechanically, and specifically, in the process of forming the battery cell, the plate and the diaphragm 13 use a winding needle as a support member of the battery cell to provide winding support for winding the battery cell, the battery cell is wound on the outer side of the winding needle, and after the step of winding the battery cell is completed, the winding needle can be taken out of the battery cell.
The main body 10 is a flat wound body formed by winding a cathode sheet 11, an anode sheet 12, and a separator 13. The cathode plate 11 includes a cathode current collector 11a and a cathode active material layer 11b, and the cathode active material layer 11b is coated on the surface of the cathode current collector 11a. Taking a lithium ion battery as an example, the material of the cathode current collector 11a may be aluminum, and the cathode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The anode sheet 12 includes an anode current collector 12a and an anode active material layer 12b, and the anode active material layer 12b is coated on the surface of the anode current collector 12a. In the case of a lithium ion battery, the material of the anode current collector 12a may be copper, and the anode active material may be carbon, silicon, or the like. The material of the separator 13 may be PP, PE, or the like. The virtual axis Y represents the line connecting all the centroids of the cross-sections of the main body portion 10.
The winding portion 101 represents a part of the cathode sheet 11, a part of the anode sheet 12, or a part of the separator 13 wound per turn in the body portion 10 formed by winding a plurality of turns. The cathode winding portion 101a represents a portion of the cathode sheet 11 wound for each turn in the main body portion 10 formed by winding a plurality of turns. The anode winding portion 101b represents a portion of the anode sheet 12 wound for each turn in the main body portion 10 formed by winding a plurality of turns. The separator wound portion 101c indicates a portion of the separator 13 wound for each turn in the main body portion 10 formed by winding a plurality of turns.
The tab portion 20 is connected to the main body portion 10, is a conductor, and is used to draw out the cathode tab 11 and the anode tab 12 of the main body portion 10. The cathode tab 21 is a tab for extracting the cathode sheet 11, and may be integrally formed with the cathode current collector 11a. The anode tab 22 represents a tab for leading out the anode tab 12, and may be formed integrally with the anode current collector 12a. In some specific embodiments, the cathode current collector 11a to which the cathode active material is not applied protrudes from the cathode current collector 11a to which the cathode active material is applied, and the portion of the cathode current collector 11a to which the cathode active material is not applied serves as a cathode tab 21. The anode current collector 12a, to which the anode active material is not applied, protrudes from the anode current collector 12a, to which the anode active material is applied, and a portion of the anode current collector 12a, to which the anode active material is not applied, serves as an anode tab 22.
One cathode tab 21 is connected to one side of the cathode wound portion 101a, and one cathode tab 21 is provided on one side of the cathode wound portion 101a along the virtual axis Y. The two cathode tabs 21 are connected to one side of the cathode winding portion 101a, and the two cathode tabs 21 are provided on one side of the cathode winding portion 101a along the virtual axis Y. One anode tab 22 is connected to one side of the anode winding portion 101b, and one anode tab 22 is provided on one side of the anode winding portion 101b along the virtual axis Y. The two anode tabs 22 are connected to one side of the anode winding portion 101b, and the two anode tabs 22 are provided on one side of the anode winding portion 101b along the virtual axis Y. The connection or arrangement of one cathode tab 21 means that only one cathode tab 21 is connected or arranged, the connection or arrangement of two cathode tabs 21 means that only two cathode tabs 21 are connected or arranged, the connection or arrangement of one anode tab 22 means that only one anode tab 22 is connected or arranged, and the connection or arrangement of two anode tabs 22 means that only two anode tabs 22 are connected or arranged.
The utility model discloses a cathode tab 21 is connected to one side of every cathode winding portion 101a in partly cathode winding portion 101a, two cathode tab 21 are connected to one side of every cathode winding portion 101a in another part cathode winding portion 101a, the quantity of cathode tab 21 has been increased on the one hand, the area of overflowing of coiled electric core 100 has been improved, on the other hand because the restraint to cathode tab 21 quantity, avoided too much cathode tab 21 and electrically conductive connection welded joint to appear the layer rosin joint.
The utility model discloses an anode tab 22 is connected to one side of every anode winding portion 101b in partly anode winding portion 101b, two anode tab 22 are connected to one side of every anode winding portion 101b in another part anode winding portion 101b, the quantity of anode tab 22 has been increased on the one hand, the area of overflowing of coiled battery core 100 has been improved, on the other hand because to the restraint of anode tab 22 quantity, avoided too much anode tab 22 and electrically conductive connection welded joint to appear the layer rosin joint.
Specifically, as shown in fig. 2, in the present embodiment, one anode tab 22 is connected to one side of each anode winding portion 101b in one part of the anode winding portions 101b, two anode tabs 22 are connected to one side of each anode winding portion 101b in the other part of the anode winding portions 101b, and the two anode tabs 22 of each anode winding portion 101b in the other part of the anode winding portions 101b are arranged axisymmetrically in the thickness direction of the main body portion 10; and, one cathode tab 21 is connected to each cathode winding portion 101 a. That is, the plurality of anode tabs 22 in the first frame S1 and the plurality of anode tabs 22 in the second frame S2 in fig. 2 are provided in axial symmetry perpendicular to the thickness direction of the body 10 and perpendicular to the virtual axis Y direction axis X.
In this embodiment, the number of the plurality of anode tabs 22 is increased compared to the number of the plurality of anode tabs 22 arranged in each circle of the anode winding portion 101b, so that the flow area of the winding-type electrical core 100 is increased, the internal resistance of the winding-type electrical core 100 is reduced, and the number of the plurality of anode tabs 22 is not large enough to cause the problem of interlayer insufficient soldering between the plurality of anode tabs 22 and the conductive connection welding joint. For example, avoiding the provision of two anode tabs 22 per turn of the anode winding portion 101b may cause a problem of interlayer cold joint of the conductive connection weld joint. The number of turns of the anode winding part 101b where the two anode tabs 22 are provided may be selected and designed particularly according to the total number of turns of the anode winding part 101 b.
With continuing reference to fig. 1-3, in the winding-type battery cell 100, the cathode plate 11 includes a cathode current collector 11a and a cathode active material layer 11b disposed on one side of the cathode current collector 11 a; the anode tab 12 includes an anode current collector 12a and an anode active material layer 12b provided on the anode current collector 12a side.
One end of the cathode tab 21 is connected to the cathode current collector 11a of the corresponding cathode winding portion 101a, and the other end is distant from the cathode current collector 11a along the virtual axis Y. One end of the anode tab 22 is connected to the anode current collector 12a of the corresponding anode winding portion 101b, and the other end is distant from the anode current collector 12a along the virtual axis Y. In the thickness direction of the body 10, a plurality of cathode tabs 21 located on the same side of the virtual axis Y are stacked, and a plurality of anode tabs 22 located on the same side of the virtual axis Y are stacked.
In some specific embodiments, the thickness of the cathode tab 21 is the same as the thickness of the cathode current collector 11 a; the thickness of the anode tab 22 is the same as that of the anode current collector 12a.
In some embodiments, as shown in fig. 2, the innermost turn of the flat wound body is a partial anode wound portion 101b; the outermost ring of the flat wound body is a partial anode winding portion 101b for preventing lithium deposition. That is, the anode wound portion 101b is wound at least one turn more than the cathode wound portion 101 a.
In some embodiments, the plurality of cathode tabs 21 arranged in a stack in the virtual axis Y direction are equal length tabs or tapered length tabs. In the virtual axis Y direction, the plurality of anode tabs 22 stacked one on another are equal-length tabs or gradual-change-length tabs. In the direction of the thickness H of the body 10, the plurality of cathode tabs 21 and anode tabs 22 stacked one on another may be arranged to overlap or partially overlap (i.e., to be staggered) or to be spaced apart from each other in the width direction. It can be understood that, in the scheme that a plurality of cathode tabs 21/anode tabs 22 arranged in a stacked manner are partially overlapped or arranged at intervals in the direction of the thickness H of the main body portion 10, the width of the plurality of cathode tabs 21/anode tabs 22 is increased, the areas of the copper switching sheet and the aluminum switching sheet are correspondingly increased, and under the condition that the design in the width direction of the battery cell is too narrow, the problem of interference between the positive electrode and the negative electrode or interference between the liquid injection hole and the cathode switching sheet exists, the former has a short circuit risk, and the latter affects the liquid injection of the battery. Therefore, in the present embodiment, the plurality of cathode tabs 21 and anode tabs 22 stacked one on another are arranged to overlap each other in the width direction.
In some embodiments, as shown in fig. 3 and 4a, in the virtual axis Y direction, the cathode tabs 21 stacked in layers are equal-length tabs, and the length L of the cathode tab 21 is 28% to 29% of the width W of the cathode winding portion 101a connected to the cathode tab 21. As shown in fig. 3 and 4b, the anode tabs 22 stacked in the direction of the virtual axis Y are equal-length tabs, and the length L of the anode tab 22 is 28% to 29% of the width W of the anode winding portion 101b connected to the anode tab 22.
In some embodiments, as shown in fig. 3, a width K1 of an end of the cathode tab 21 away from the cathode current collector 11a is 10% to 12.5% of a circumference of the innermost coil winding portion 101 of the flat winding body, and a width K2 of an end of the cathode tab 21 connected to the cathode current collector 11a is 11% to 14% of the circumference of the innermost coil winding portion 101 of the flat winding body. In some embodiments, the flat wound body has a length direction and a width direction; a longitudinal direction, that is, a longitudinal direction of the flat wound body before winding or after unwinding in the winding direction; the virtual axis Y is parallel to the width direction; the width of the anode pole piece 12 is larger than that of the cathode pole piece 11, and the length of the anode pole piece 12 is larger than that of the cathode pole piece 11.
In some embodiments, one side of each of the cathode windings 101a is connected with a cathode tab 21, in particular with one or two cathode tabs 21. One side of each of the anode winding portions 101b is connected with an anode tab 22, specifically, one or two anode tabs 22. Or, one side of each cathode winding part 101a in the cathode winding parts 101a is connected with a cathode tab 21, specifically, connected with one or two cathode tabs 21; in the anode winding portion 101b, the anode winding portion 101b at the innermost circle or the anode winding portion 101b at the outermost circle is not provided with the anode tab 22, and one side of each of the other anode winding portions 101b is connected with the anode tab 22, specifically, connected with one or two anode tabs 22.
In the wound battery cell 100 of some embodiments, two cathode tabs 21 are connected to one side of each cathode winding part 101a in the first half of the cathode winding parts 101a, and one cathode tab 21 is connected to one side of each cathode winding part 101a in the second half of the cathode winding parts 101a, in the direction from the inner ring to the outer ring (as shown in fig. 6 and 7).
And/or, two anode tabs 22 are connected to one side of each anode winding part 101b in the first half of the anode winding parts 101b and one anode tab 22 is connected to one side of each anode winding part 101b in the second half of the anode winding parts 101b in the direction from the inner ring to the outer ring (as shown in fig. 2 and 7).
Specifically, two cathode tabs 21 are connected to the inner ring cathode winding portion 101a of the winding type battery cell 100, and one cathode tab 21 is connected to the outer ring cathode winding portion 101a, so that the flow area of the winding type battery cell 100 is increased, the internal resistance of the winding type battery cell 100 is reduced, the number of the plurality of cathode tabs 21 is not large enough to cause the problem of interlayer cold joint between the excessive cathode tabs 21 and the conductive connection welding joint, and the arrangement mode of the plurality of cathode tabs 21 makes the distance between the cathode tabs 21 close, so that the welding effect is good. Two anode tabs 22 are connected to one side of the anode winding portion 101b of the winding type battery cell 100, one anode tab 22 is connected to one side of the outer ring anode winding portion 101b, the flow area of the winding type battery cell 100 is increased, the internal resistance of the winding type battery cell 100 is reduced, the problem of interlayer cold joint of excessive anode tabs 22 and conductive connection welding joints is solved due to the quantity of the plurality of anode tabs 22, the anode tabs 22 are close to each other due to the arrangement mode of the plurality of anode tabs 22, and the welding effect is good.
Referring to fig. 5base:Sub>A-5B, fig. 5base:Sub>A isbase:Sub>A second partial cross-sectional view of the wound cell shown in fig. 2 taken along linebase:Sub>A-base:Sub>A, and fig. 5B isbase:Sub>A second partial cross-sectional view of the wound cell shown in fig. 2 taken along line B-B.
Referring to fig. 5a and 5b, the winding type battery cell 100 provided by the present embodiment is different from the winding type battery cell 100 provided by fig. 4a in that: as shown in fig. 5a, in the virtual axis Y direction, the plurality of cathode tabs 21 of the present embodiment are tabs with gradually changing lengths, and among the plurality of cathode tabs 21, the maximum length of the cathode tab 21 is 28% to 29% of the width W of the cathode winding portion 101a connected to the cathode tab 21, and the minimum length of the cathode tab 21 is 19% to 20% of the width W of the cathode winding portion 101a connected to the cathode tab 21; the lengths L of the plurality of cathode tabs 21 which are arranged in a stacked mode gradually decrease layer by layer along the direction from the inner ring to the outer ring according to the size of the equal difference.
As shown in fig. 5b, the plurality of anode tabs 22 stacked in layers are tabs with gradually changed lengths, and among the plurality of anode tabs 22, the maximum length of the anode tab 22 is 28% to 29% of the width W of the anode winding portion 101b connected to the anode tab 22, and the minimum length of the anode tab 22 is 19% to 20% of the width W of the anode winding portion 101b connected to the anode tab 22; the lengths L of the anode tabs 22 which are arranged in a laminated manner gradually decrease from one layer to the next layer along the direction from the inner ring to the outer ring according to the size of the equal difference.
Referring to fig. 6, fig. 6 is a schematic top view of a winding type battery cell according to a second embodiment of the present disclosure.
Referring to fig. 6, the winding type battery cell 100 provided in the present embodiment is different from the winding type battery cell 100 provided in fig. 2 in that: in the present embodiment, one cathode tab 21 is connected to one side of each cathode winding portion 101a in one part of the cathode winding portions 101a, two cathode tabs 21 are connected to one side of each cathode winding portion 101a in the other part of the cathode winding portions 101a, and the two cathode tabs 21 of each cathode winding portion 101a in the other part of the cathode winding portions 101a are arranged axisymmetrically in the thickness direction H of the main body portion 10; and, one anode tab 22 is connected to each anode winding portion 101 b.
In this embodiment, the number of the plurality of cathode tabs 21 is increased compared with the number of the cathode tabs 21 arranged in each circle of the cathode winding portion 101a, so that the flow area of the winding-type battery cell 100 is increased, the internal resistance of the winding-type battery cell 100 is reduced, and the number of the plurality of cathode tabs 21 is not large enough to cause the problem of interlayer cold joint between the excessive cathode tabs 21 and the conductive connection welded joint.
Referring to fig. 7, fig. 7 is a schematic top view of a winding type battery cell according to a third embodiment of the present disclosure.
Referring to fig. 7, the winding type battery cell 100 shown in the present embodiment is different from the winding type battery cell 100 shown in fig. 2 in that: in the wound battery cell 100 provided in the present embodiment, one cathode tab 21 is connected to one side of each cathode winding portion 101a in one part of the cathode winding portions 101a, and two cathode tabs 21 are connected to one side of each cathode winding portion 101a in the other part of the cathode winding portions 101 a. One side of each anode winding portion 101b of one part of the anode winding portions 101b is connected to one anode tab 22, and one side of each anode winding portion 101b of the other part of the anode winding portions 101b is connected to two anode tabs 22.
In the above embodiment, the number of the multiple cathode tabs 21 and the number of the multiple anode tabs 22 are increased, so that the overall flow area of the winding type battery cell 100 is increased, the phenomenon that the excessive cathode tabs 21, the excessive anode tabs 22 and the conductive connection welded joints are subjected to interlayer cold joint is avoided, the increasing trends of the number of the multiple cathode tabs 21 and the number of the multiple anode tabs 22 are the same, and a synergistic effect is achieved on the improvement of the overall overcurrent capacity of the winding type battery cell 100.
In some embodiments, two cathode tabs 21 are connected to one side of each of the odd-numbered cathode wound sections 101a and one cathode tab 21 is connected to one side of each of the even-numbered cathode wound sections 101a in a direction from the inner ring to the outer ring. Or, one cathode tab 21 is connected to one side of each of the cathode winding parts 101a of the odd-numbered turns of the cathode winding parts 101a, and two cathode tabs 21 are connected to one side of each of the cathode winding parts 101a of the even-numbered turns of the cathode winding parts 101 a. And/or, in the direction from the inner ring to the outer ring, one side of each anode winding part 101b in the anode winding parts 101b of the odd-numbered rings is connected with two anode tabs 22, and one side of each anode winding part 101b in the anode winding parts 101b of the even-numbered rings is connected with one anode tab 22; or, one anode tab 22 is connected to one side of each of the anode winding parts 101b of the odd-numbered turns of the anode winding parts 101b, and two anode tabs 22 are connected to one side of each of the anode winding parts 101b of the even-numbered turns of the anode winding parts 101 b.
Referring to fig. 8, fig. 8 is a schematic top view of a winding type battery cell according to a fourth embodiment of the present disclosure.
Referring to fig. 8, the winding type battery cell 100 shown in the present embodiment is different from the winding type battery cell 100 shown in fig. 2 in that: in the present embodiment, two cathode tabs 21 are connected to one side of each of the cathode winding portions 101a in the cathode winding portions 101a of the odd-numbered turns, one cathode tab 21 is connected to one side of each of the cathode winding portions 101a in the cathode winding portions 101a of the even-numbered turns, and one anode tab 22 is connected to one side of each of the anode winding portions 101b in the direction from the inner turn to the outer turn. This kind of mode of setting has realized the effect that increases the area of overflowing of coiling formula electricity core 100 on the one hand, and on the other hand makes the distribution of a plurality of negative pole utmost point ears 21 balanced, guarantees the welding effect of a plurality of negative pole utmost point ears 21.
Referring to fig. 9, fig. 9 is a schematic top view of a fifth embodiment of a winding type battery cell provided in the present application.
Referring to fig. 9, the wound battery cell 100 shown in the present embodiment is different from the wound battery cell 100 shown in fig. 2 in that: in the present embodiment, two anode tabs 22 are connected to one side of each of the anode winding portions 101b in the odd-numbered turns of the anode winding portion 101b, one anode tab 22 is connected to one side of each of the anode winding portions 101b in the even-numbered turns of the anode winding portion 101b, and one cathode tab 21 is connected to one side of each of the cathode winding portions 101a in the direction from the inner ring to the outer ring. This kind of mode of setting has realized increasing the effect of the area of overflowing of coiling formula electricity core 100 on the one hand, and on the other hand makes a plurality of anode tabs 22's distribution balanced, guarantees a plurality of anode tabs 22's welding effect.
Referring to fig. 10, fig. 10 is a schematic top view of a sixth embodiment of a winding type battery cell provided in the present application.
Referring to fig. 10, the winding type battery cell 100 shown in the present embodiment is different from the winding type battery cell 100 shown in fig. 2 in that: in the present embodiment, two anode tabs 22 are connected to one side of each of the anode winding portions 101b of the odd-numbered turns and one anode tab 22 is connected to one side of each of the anode winding portions 101b of the even-numbered turns in the direction from the inner turn to the outer turn. And in the direction from the inner ring to the outer ring, two cathode tabs 21 are connected to one side of each cathode winding portion 101a in the cathode winding portions 101a of the odd-numbered rings, one cathode tab 21 is connected to one side of each cathode winding portion 101a in the cathode winding portions 101a of the even-numbered rings, and one anode tab 22 is connected to one side of each anode winding portion 101b of the even-numbered rings. This kind of mode of setting has realized the effect that increases the area of overflowing of coiling formula electricity core 100 on the one hand, and on the other hand makes a plurality of negative pole utmost point ears 21 and the distribution of positive pole utmost point ear 22 balanced, guarantees a plurality of negative pole utmost point ears 21 and the welding effect of positive pole utmost point ear 22.
Referring to fig. 11, fig. 11 is a schematic structural diagram of a battery provided in the present application.
Referring to fig. 11, the present application provides a battery 200 including a casing 210 and any of the winding type battery cells 100 described above.
In this embodiment, the battery 200 represents a single physical module including one or more wound cells 100 (as shown in fig. 1-10) to provide higher voltage and capacity. The winding type battery cell 100 includes a body portion 10 and a tab portion 20. The main body 10 includes a cathode plate 11, an anode plate 12, and a separator 13. The separator 13 is laminated between the cathode sheet 11 and the anode sheet 12. The main body 10 is wound around the virtual axis Y to form a flat wound body. The main body 10 includes a plurality of windings 101 in the winding direction. The winding portion 101 includes a cathode winding portion 101a, an anode winding portion 101b, and a separator winding portion 101c. The tab portion 20 is connected to one side of the body portion 10 and includes a plurality of cathode tabs 21 and a plurality of anode tabs 22.
One cathode tab 21 is connected to one side of each cathode winding portion 101a of one portion of the cathode winding portions 101a, and two cathode tabs 21 are connected to one side of each cathode winding portion 101a of the other portion of the cathode winding portions 101 a. The two cathode tabs 21 of each cathode winding portion 101a of the other portion of cathode winding portions 101a are located on opposite sides of the virtual axis Y in the thickness H direction of the main body portion 10.
And/or one side of each anode winding part 101b of one part of the anode winding parts 101b is connected with one anode tab 22, and one side of each anode winding part 101b of the other part of the anode winding parts 101b is connected with two anode tabs 22. The two anode tabs 22 of each anode winding portion 101b of the other part of the anode winding portions 101b are located on opposite sides of the virtual axis Y in the thickness direction of the main body portion 10.
Referring to fig. 12, fig. 12 is a schematic structural diagram of a battery assembly provided in the present application.
Referring to fig. 12, the present application provides a battery assembly 300 including the above-described battery 200. The battery assembly 300 may further include a case for providing a receiving space for the battery 200, and the case may have various shapes. In the battery assembly 300, the plurality of batteries 200 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the plurality of batteries 200. The plurality of batteries 200 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of batteries 200 is accommodated in the box body; of course, the battery assembly 300 may also be a battery module formed by connecting a plurality of batteries 200 in series, in parallel, or in series-parallel, and a plurality of battery modules are connected in series, in parallel, or in series-parallel to form a whole and are accommodated in the case. The battery assembly 300 may further include other structures, for example, the battery assembly 300 may further include a bus member for achieving electrical connection between the plurality of batteries 200. Wherein each battery 200 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery.
Referring to fig. 13, fig. 13 is a schematic structural diagram of an electric device provided in the present application.
Referring to fig. 13, the present application provides an electric device including the above battery assembly 300.
The electric device can be a mobile phone, a computer, an electric motorcycle, an electric automobile and the like. The present embodiment will be described with reference to an electric vehicle 400 as an example. The battery assembly 300 is disposed inside the electric vehicle 400, and the battery assembly 300 may be disposed at the bottom or the head or the tail of the electric vehicle 400. The battery assembly 300 may be used for power supply of the electric vehicle 400, for example, the battery assembly 300 may serve as an operation power source of the electric vehicle 400. The electric vehicle 400 may further include a controller 401 and a motor 402, the controller 401 being configured to control the battery assembly 300 to power the motor 402, for example, for start-up, navigation, and operational power requirements of the electric vehicle 400 during driving.
In some embodiments of the present application, the battery assembly 300 may serve as an operating power source of the electric vehicle 400 and also as a driving power source of the electric vehicle 400 to provide driving power for the electric vehicle 400.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (17)
1. The utility model provides a coiling type electricity core which characterized in that includes:
the main body part comprises a cathode pole piece, an anode pole piece and a diaphragm; the diaphragm is arranged between the cathode pole piece and the anode pole piece in a laminated manner; the main body part is wound around a virtual axis to form a flat wound body; the main body part comprises a plurality of turns of winding parts along the winding direction; the winding part comprises a cathode winding part, an anode winding part and a diaphragm winding part;
a tab part connected to one side of the body part and including a plurality of cathode tabs and a plurality of anode tabs;
wherein one side of each of the cathode winding parts in one part of the cathode winding parts is connected with one cathode tab, and one side of each of the cathode winding parts in the other part of the cathode winding parts is connected with two cathode tabs; the two cathode tabs of each of the other part of the cathode winding parts are located on opposite sides of the virtual axis in the thickness direction of the main body part; and/or the presence of a gas in the gas,
one side of each anode winding part in one part of the anode winding parts is connected with one anode tab, and one side of each anode winding part in the other part of the anode winding parts is connected with two anode tabs; the two anode tabs of each of the other part of the anode winding parts are located on opposite sides of the virtual axis in the thickness direction of the main body part.
2. The wound battery cell of claim 1, wherein one side of each of the cathode winding portions in one portion of the cathode winding portions is connected to one cathode tab, one side of each of the cathode winding portions in another portion of the cathode winding portions is connected to two cathode tabs, and the two cathode tabs of each of the cathode winding portions in the another portion of the cathode winding portions are arranged axisymmetrically in the thickness direction of the main body portion; and each anode winding part is connected with one anode tab.
3. The wound battery cell according to claim 1, wherein one side of each of the anode winding portions in one part of the anode winding portions is connected to one anode tab, and one side of each of the anode winding portions in another part of the anode winding portions is connected to two anode tabs, and the two anode tabs of each of the anode winding portions in the another part of the anode winding portions are axisymmetrically arranged in the thickness direction of the main body portion; and each cathode winding part is connected with one cathode tab.
4. The wound cell of claim 1, wherein, in a direction from the inner circle to the outer circle, one side of each of the first half of the cathode windings is connected with two cathode tabs, and one side of each of the second half of the cathode windings is connected with one cathode tab; and/or the presence of a gas in the gas,
and in the direction from the inner ring to the outer ring, one side of each anode winding part in the first half of the anode winding parts is connected with two anode tabs, and one side of each anode winding part in the second half of the anode winding parts is connected with one anode tab.
5. The wound cell of claim 1, wherein, in a direction from the inner circle to the outer circle, one side of each of the cathode windings of the odd-numbered turns is connected with two cathode tabs, and one side of each of the cathode windings of the even-numbered turns is connected with one cathode tab; or, one side of each cathode winding part in the cathode winding parts of the odd turns is connected with one cathode tab, and one side of each cathode winding part in the cathode winding parts of the even turns is connected with two cathode tabs; and/or the presence of a gas in the gas,
along the direction from the inner ring to the outer ring, one side of each anode winding part in the anode winding parts of the odd number of rings is connected with two anode tabs, and one side of each anode winding part in the anode winding parts of the even number of rings is connected with one anode tab; or, one side of each anode winding part in the anode winding parts of the odd turns is connected with one anode tab, and one side of each anode winding part in the anode winding parts of the even turns is connected with two anode tabs.
6. The wound cell of claim 1, wherein the cathode sheet comprises a cathode current collector and a cathode active material layer disposed on one side of the cathode current collector; the anode piece comprises an anode current collector and an anode active substance layer arranged on one side of the anode current collector;
one end of the cathode tab is connected with the cathode current collector of the corresponding cathode winding part, and the other end of the cathode tab is far away from the cathode current collector along the virtual axis; one end of the anode tab is connected with the anode current collector of the corresponding anode winding part, and the other end of the anode tab is far away from the anode current collector along the virtual axis; along the thickness direction of the main body part, a plurality of cathode tabs located on the same side of the virtual axis are arranged in a stacked mode, and a plurality of anode tabs located on the same side of the virtual axis are arranged in a stacked mode.
7. The wound cell of claim 6, wherein the thickness of the cathode tab is the same as the thickness of the cathode current collector; the thickness of the anode tab is the same as that of the anode current collector.
8. The wound electrical core according to claim 6, wherein in the virtual axis direction, the plurality of stacked cathode tabs are equal-length tabs or gradually-changed-length tabs; in the virtual axis direction, the anode tabs which are arranged in a stacked manner are tabs with equal length or tabs with gradually changed length.
9. The wound battery cell of claim 8, wherein the cathode tabs arranged in a stacked manner are equal-length tabs, and the length of each cathode tab is 28% -29% of the width of the cathode winding portion connected with the cathode tab; the anode tabs are equal in length and the length of each anode tab is 28% -29% of the width of the anode winding part connected with the anode tabs.
10. The wound battery cell of claim 8, wherein the stacked cathode tabs are gradual-length tabs, and of the cathode tabs, the maximum length of the cathode tab is 28% to 29% of the width of the cathode winding portion connected to the cathode tab, and the minimum length of the cathode tab is 19% to 20% of the width of the cathode winding portion connected to the cathode tab; the lengths of the laminated cathode tabs are gradually decreased layer by layer along the direction from the inner ring to the outer ring according to the equal difference size;
the anode tab comprises a plurality of anode tabs, wherein the anode tabs are stacked and arranged in a gradual change length mode, the maximum length of each anode tab is 28% -29% of the width of an anode winding part connected with the anode tab, and the minimum length of each anode tab is 19% -20% of the width of the anode winding part connected with the anode tab; the lengths of the anode tabs which are arranged in a stacked mode are gradually decreased layer by layer according to the size of the equal difference from the inner ring to the outer ring.
11. The wound battery cell of claim 6, wherein the width of the end of the cathode tab away from the cathode current collector is 10% to 12.5% of the circumference of the innermost coil of the flat wound body, and the width of the end of the cathode tab connected to the cathode coil is 11% to 14% of the circumference of the innermost coil of the flat wound body.
12. The wound cell of claim 1, wherein the flat wound body has a length direction and a width direction; the virtual axis is parallel to the width direction; the width of the anode pole piece is larger than that of the cathode pole piece, and the length of the anode pole piece is larger than that of the cathode pole piece.
13. The wound battery cell according to claim 1, wherein an innermost circle of the flat wound body is a part of the anode winding portion; the outermost ring of the flat wound body is a part of the anode wound portion.
14. The wound cell of claim 13, wherein one or two cathode tabs are connected to one side of each of the cathode windings; one side of each anode winding part in the anode winding parts is connected with one or two anode tabs; or the like, or, alternatively,
one side of each cathode winding part in the cathode winding parts is connected with one or two cathode tabs; in the anode winding part, the anode winding part at the innermost circle or the anode winding part at the outermost circle is not provided with the anode tabs, and one or two anode tabs are connected to one side of each of the other anode winding parts.
15. A battery comprising the wound cell of any one of claims 1 to 14.
16. A battery pack comprising the battery of claim 15.
17. An electrical device comprising the battery assembly of claim 16.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222831093.5U CN218448361U (en) | 2022-10-26 | 2022-10-26 | Winding type battery cell, battery assembly and power utilization device |
| PCT/CN2023/120176 WO2024087957A1 (en) | 2022-10-26 | 2023-09-20 | Wound battery cell, battery, battery assembly, and electrical apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222831093.5U CN218448361U (en) | 2022-10-26 | 2022-10-26 | Winding type battery cell, battery assembly and power utilization device |
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| CN218448361U true CN218448361U (en) | 2023-02-03 |
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| CN202222831093.5U Active CN218448361U (en) | 2022-10-26 | 2022-10-26 | Winding type battery cell, battery assembly and power utilization device |
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| WO (1) | WO2024087957A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024087957A1 (en) * | 2022-10-26 | 2024-05-02 | 宁德时代新能源科技股份有限公司 | Wound battery cell, battery, battery assembly, and electrical apparatus |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299294B (en) * | 2011-07-14 | 2013-12-18 | 美国电化学动力公司 | Fragment type cell and preparation method thereof |
| KR20150030537A (en) * | 2013-09-12 | 2015-03-20 | 디지야 에너지 세이빙 테크놀로지 인코포레이티드 | Single winding core having plural tabs, lithium cell with the single winding core and successive winding method for the single winding core |
| JP7208871B2 (en) * | 2019-07-26 | 2023-01-19 | ニチコン株式会社 | CAPACITOR, CAPACITOR MANUFACTURING APPARATUS, AND CAPACITOR MANUFACTURING METHOD |
| CN212062614U (en) * | 2019-12-26 | 2020-12-01 | 惠州比亚迪实业有限公司 | Winding type battery cell and lithium ion battery |
| CN112889181B (en) * | 2020-01-20 | 2022-06-17 | 宁德新能源科技有限公司 | Electrode assembly and battery |
| JP2023531331A (en) * | 2020-06-02 | 2023-07-24 | 寧徳時代新能源科技股▲分▼有限公司 | Electrode assembly and its associated battery, device, manufacturing method, and manufacturing apparatus |
| CN212571274U (en) * | 2020-08-10 | 2021-02-19 | 北京小米移动软件有限公司 | Lithium ion battery and electronic device |
| CN212907831U (en) * | 2020-09-15 | 2021-04-06 | 珠海冠宇电池股份有限公司 | Lithium ion battery |
| CN218448361U (en) * | 2022-10-26 | 2023-02-03 | 宁德时代新能源科技股份有限公司 | Winding type battery cell, battery assembly and power utilization device |
-
2022
- 2022-10-26 CN CN202222831093.5U patent/CN218448361U/en active Active
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- 2023-09-20 WO PCT/CN2023/120176 patent/WO2024087957A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024087957A1 (en) * | 2022-10-26 | 2024-05-02 | 宁德时代新能源科技股份有限公司 | Wound battery cell, battery, battery assembly, and electrical apparatus |
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